John R Pierce wrote:
Karl R. Balsmeier wrote:
How does one configure a fence device in the form of a NIC card in
centos 5? Is the gnbd item relevant to this?
I'm not sure what 'a fence device in the form of a NIC card' is. the
fence devices I'm familiar with include SCSI fence switches,
fiberchannel SAN switches, and APC SmartPlug power switches.
in my test cluster, I used a Qlogic SANbox fiber switch to connect the
cluster nodes to the shared storage. the fencing was done by
sending the Qlogic the commands to enable/disable the ports of the two
nodes so only the active node could access the shared storage.
I suppose an Ethernet analog in an ISCSI SAN environment would be to
send commands to a layer-2 or layer-3 managed switch to manipulate the
VLANs to disable the standby nodes from accessing the ISCSI target
device. These systems would need separate dedicated NICs for LAN
connectivity and cluster heartbeats.
OK, so it sounds like I have enough ethernet devices, and your notes
help me to understand the purpose and nature of fencing a lot more. I
just need to isolate the potential on the iSCSI side of the equation as
far as sending those signals to the managed switch.
Right now I run on extreme summit switches which should suffice, and
broadcomm GBNICs.
The iSCSI device we are using is a PromiseRAID M300i or M500i.
It sounds on the surface like we might need a more solid fencing
device... Anyone agree or disagree?
-karl
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